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一种LED背光灯镜像恒流电路

更新时间:2020-09-18 04:19:39 大小:197K 上传用户:六3无线电查看TA发布的资源 标签:led电路 下载积分:2分 评价赚积分 (如何评价?) 收藏 评论(0) 举报

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本设计电路适用于LED背光灯的恒流源,该电路包含镜像自调恒流电路、镜像恒流电路、Boost恒流驱动器、Boost升压电路、过压保护电路、Boost调整电路。其中镜像自调恒流电路包括驱动源晶体管、电流镜晶体管、比例电阻、取样电阻、LED灯。采用模拟调光方式镜像恒流原理驱动多路LED灯串,使多路LED灯发光强度稳定,噪声小,光谱连续;具有可方便扩展LED灯路串,以较低成本,简单设计就可解决LED背光灯恒流驱动通道端口过多、复杂的问题等优点。

The design circuit is suitable for the constant current source of the LED backlight, which comprises a mirror self regulating constant current circuit, a mirror constant current circuit, a Boost constant current driver, a Boost boost circuit, an overvoltage protection circuit, and a Boost adjusting circuit. The mirror self regulating constant current circuit comprises a driving source transistor, a current mirror transistor, a proportional resistance, a sampling resistor and a LED lamp. The analog dimming method is used to mirror the constant current principle to drive the multi-channel LED light string, which makes the light emitting intensity of the multi-channel LED lamp is stable, the noise is small, and the spectru...

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一种LED背光灯镜像恒流电路.pdf 197K

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